diff --git a/llvm/include/llvm/Analysis/ProfileSummaryInfo.h b/llvm/include/llvm/Analysis/ProfileSummaryInfo.h
--- a/llvm/include/llvm/Analysis/ProfileSummaryInfo.h
+++ b/llvm/include/llvm/Analysis/ProfileSummaryInfo.h
@@ -24,7 +24,7 @@
 namespace llvm {
 class BasicBlock;
 class BlockFrequencyInfo;
-class CallSite;
+class CallBase;
 class Instruction;
 class ProfileSummary;
 /// Analysis providing profile information.
@@ -144,10 +144,10 @@
   /// cold percentile cutoff value.
   bool isColdBlockNthPercentile(int PercentileCutoff,
                                 const BasicBlock *BB, BlockFrequencyInfo *BFI);
-  /// Returns true if CallSite \p CS is considered hot.
-  bool isHotCallSite(const CallSite &CS, BlockFrequencyInfo *BFI);
-  /// Returns true if Callsite \p CS is considered cold.
-  bool isColdCallSite(const CallSite &CS, BlockFrequencyInfo *BFI);
+  /// Returns true if the call site \p CB is considered hot.
+  bool isHotCallSite(const CallBase &CB, BlockFrequencyInfo *BFI);
+  /// Returns true if call site \p CB is considered cold.
+  bool isColdCallSite(const CallBase &CB, BlockFrequencyInfo *BFI);
   /// Returns HotCountThreshold if set. Recompute HotCountThreshold
   /// if not set.
   uint64_t getOrCompHotCountThreshold();
diff --git a/llvm/lib/Analysis/InlineCost.cpp b/llvm/lib/Analysis/InlineCost.cpp
--- a/llvm/lib/Analysis/InlineCost.cpp
+++ b/llvm/lib/Analysis/InlineCost.cpp
@@ -1173,7 +1173,7 @@
   // If global profile summary is available, then callsite's coldness is
   // determined based on that.
   if (PSI && PSI->hasProfileSummary())
-    return PSI->isColdCallSite(CallSite(&Call), CallerBFI);
+    return PSI->isColdCallSite(Call, CallerBFI);
 
   // Otherwise we need BFI to be available.
   if (!CallerBFI)
@@ -1197,8 +1197,7 @@
 
   // If global profile summary is available, then callsite's hotness is
   // determined based on that.
-  if (PSI && PSI->hasProfileSummary() &&
-      PSI->isHotCallSite(CallSite(&Call), CallerBFI))
+  if (PSI && PSI->hasProfileSummary() && PSI->isHotCallSite(Call, CallerBFI))
     return Params.HotCallSiteThreshold;
 
   // Otherwise we need BFI to be available and to have a locally hot callsite
diff --git a/llvm/lib/Analysis/ProfileSummaryInfo.cpp b/llvm/lib/Analysis/ProfileSummaryInfo.cpp
--- a/llvm/lib/Analysis/ProfileSummaryInfo.cpp
+++ b/llvm/lib/Analysis/ProfileSummaryInfo.cpp
@@ -101,6 +101,7 @@
   return true;
 }
 
+// FIXME(CallSite): the parameter should be a CallBase.
 Optional<uint64_t>
 ProfileSummaryInfo::getProfileCount(const Instruction *Inst,
                                     BlockFrequencyInfo *BFI,
@@ -385,21 +386,21 @@
   return isHotOrColdBlockNthPercentile<false>(PercentileCutoff, BB, BFI);
 }
 
-bool ProfileSummaryInfo::isHotCallSite(const CallSite &CS,
+bool ProfileSummaryInfo::isHotCallSite(const CallBase &CB,
                                        BlockFrequencyInfo *BFI) {
-  auto C = getProfileCount(CS.getInstruction(), BFI);
+  auto C = getProfileCount(&CB, BFI);
   return C && isHotCount(*C);
 }
 
-bool ProfileSummaryInfo::isColdCallSite(const CallSite &CS,
+bool ProfileSummaryInfo::isColdCallSite(const CallBase &CB,
                                         BlockFrequencyInfo *BFI) {
-  auto C = getProfileCount(CS.getInstruction(), BFI);
+  auto C = getProfileCount(&CB, BFI);
   if (C)
     return isColdCount(*C);
 
   // In SamplePGO, if the caller has been sampled, and there is no profile
   // annotated on the callsite, we consider the callsite as cold.
-  return hasSampleProfile() && CS.getCaller()->hasProfileData();
+  return hasSampleProfile() && CB.getCaller()->hasProfileData();
 }
 
 INITIALIZE_PASS(ProfileSummaryInfoWrapperPass, "profile-summary-info",
diff --git a/llvm/unittests/Analysis/ProfileSummaryInfoTest.cpp b/llvm/unittests/Analysis/ProfileSummaryInfoTest.cpp
--- a/llvm/unittests/Analysis/ProfileSummaryInfoTest.cpp
+++ b/llvm/unittests/Analysis/ProfileSummaryInfoTest.cpp
@@ -12,7 +12,6 @@
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/AsmParser/Parser.h"
 #include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/CallSite.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/LLVMContext.h"
@@ -134,7 +133,7 @@
   EXPECT_FALSE(PSI.isHotBlock(&BB0, &BFI));
   EXPECT_FALSE(PSI.isColdBlock(&BB0, &BFI));
 
-  CallSite CS1(BB1->getFirstNonPHI());
+  CallBase &CS1 = *cast<CallBase>(BB1->getFirstNonPHI());
   EXPECT_FALSE(PSI.isHotCallSite(CS1, &BFI));
   EXPECT_FALSE(PSI.isColdCallSite(CS1, &BFI));
 }
@@ -228,9 +227,9 @@
   EXPECT_TRUE(PSI.isColdBlockNthPercentile(10000, BB2, &BFI));
   EXPECT_TRUE(PSI.isColdBlockNthPercentile(10000, BB3, &BFI));
 
-  CallSite CS1(BB1->getFirstNonPHI());
+  CallBase &CS1 = *cast<CallBase>(BB1->getFirstNonPHI());
   auto *CI2 = BB2->getFirstNonPHI();
-  CallSite CS2(CI2);
+  CallBase &CS2 = *cast<CallBase>(CI2);
 
   EXPECT_TRUE(PSI.isHotCallSite(CS1, &BFI));
   EXPECT_FALSE(PSI.isHotCallSite(CS2, &BFI));
@@ -323,14 +322,14 @@
   EXPECT_TRUE(PSI.isColdBlockNthPercentile(10000, BB2, &BFI));
   EXPECT_TRUE(PSI.isColdBlockNthPercentile(10000, BB3, &BFI));
 
-  CallSite CS1(BB1->getFirstNonPHI());
+  CallBase &CS1 = *cast<CallBase>(BB1->getFirstNonPHI());
   auto *CI2 = BB2->getFirstNonPHI();
   // Manually attach branch weights metadata to the call instruction.
   SmallVector<uint32_t, 1> Weights;
   Weights.push_back(1000);
   MDBuilder MDB(M->getContext());
   CI2->setMetadata(LLVMContext::MD_prof, MDB.createBranchWeights(Weights));
-  CallSite CS2(CI2);
+  CallBase &CS2 = *cast<CallBase>(CI2);
 
   EXPECT_FALSE(PSI.isHotCallSite(CS1, &BFI));
   EXPECT_TRUE(PSI.isHotCallSite(CS2, &BFI));